'use strict'
const semver = require('semver')
const colors = require('colors')
const LOWEST_NODE_VERSION = '10.0.0'

class Command {
  constructor(argv) {
    if (!argv) {
      throw new Error('参数不能为空！')
    }
    if (!Array.isArray(argv)) {
      throw new Error('参数必须为数组！')
    }
    if (argv.length < 1) {
      throw new Error('参数列表为空！')
    }
    this._argv = argv
    new Promise((resolve, reject) => {
      let chain = Promise.resolve()
      chain = chain.then(() => this.checkNodeVersion())
      chain = chain.then(() => this.initArgs())
      chain = chain.then(() => this.init())
      chain = chain.then(() => this.exec())
      chain.catch((err) => {
        console.log(err.message)
      })
    })
  }
  initArgs() {
    this._cmd = this._argv[this._argv.length - 1]
    this._argv = this._argv.slice(0, this._argv.length - 1)
    // console.log('_cmd', this._cmd)
    // console.log('_argv', this._argv)
  }

  checkNodeVersion() {
    if (!semver.gte(process.version, LOWEST_NODE_VERSION)) {
      throw new Error(
        colors.red(
          `medlog-cli-dev 需要安装 v${LOWEST_NODE_VERSION} 以上版本的 Node.js`
        )
      )
    }
  }
  init() {
    throw new Error('init必须实现')
  }
  exec() {
    throw new Error('exec必须实现')
  }
}
module.exports = Command
